I don't think you can pump carbon dioxide into the atmosphere indefinitely and not have a reaction. But there are great scientists such as Freeman Dyson, one of the greatest physicists of the last hundred years, who has studied the question, who believes quite the opposite. The reason transnational action is so difficult is because the major problem with climate change is, A, that there is no consensus, and, B, that the economic cost is simply staggering. Reversing it completely might mean undoing the modern industrial economy.

Increasing public safety almost always means restricting liberties.

Under our constitutional system, the executive executes the laws that Congress has passed. It should not be executing laws that Congress has rejected.

Science has everything to say about what is possible. Science has nothing to say about what is permissible.

Pass legislation. When Obama signs, you've shown seriousness and the ability to govern. When he vetoes, you've clarified the differences between party philosophies and prepared the ground for 2016.

Every new president flatters himself that he, kinder and gentler, is beginning the world anew. Yet, when Barack Obama in his inaugural address reached out to Muslims by saying, 'To the Muslim world, we seek a new way forward, based on mutual interest and mutual respect,' his formulation was needlessly defensive and apologetic.

Obama's Democrats have become the part of no. Real cuts to federal budget? No. Entitlement reform? No. Tax reform? No. Breaking the corrupt and fiscally unsustainable symbiosis between public-sector unions and state governments? Hell no.